/*
 *
 *  Copyright 2018 the original author or authors.
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *         http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 *
 */
package springfox.documentation.schema;

import com.fasterxml.classmate.ResolvedType;
import com.fasterxml.classmate.TypeResolver;

import java.util.List;
import java.util.stream.Stream;

/**
 * Modified solution from https://github.com/springfox/springfox/issues/2287
 */
public class RecursiveAlternateTypeRule extends AlternateTypeRule {

    private List<AlternateTypeRule> rules;

    public RecursiveAlternateTypeRule(TypeResolver typeResolver, List<AlternateTypeRule> rules) {
        // Unused but cannot be null
        super(typeResolver.resolve(Object.class), typeResolver.resolve(Object.class));
        this.rules = rules;
    }

    @Override
    public ResolvedType alternateFor(ResolvedType type) {
        Stream<ResolvedType> rStream = rules.stream().flatMap(rule -> Stream.of(rule.alternateFor(type)));
        ResolvedType newType = rStream
                .filter(alternateType -> alternateType != type).findFirst().orElse(type);

        if (appliesTo(newType)) {
            // Recursion happens here
            return alternateFor(newType);
        }

        return newType;
    }

    @Override
    public boolean appliesTo(ResolvedType type) {
        return rules.stream().anyMatch(rule -> rule.appliesTo(type));
    }
}